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Free molecular flow
Free molecular flow describes the fluid dynamics of gas where the mean free path of the molecules is larger than the size of the chamber or of the object under test. For tubes/objects of the size of several cm, these means pressures well below 10-3 torr. This is also called the regime of high vacuum. E.g. 
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Free_molecular_flow". A list of authors is available in Wikipedia.|